31577990400 has 864 divisors, whose sum is σ = 130022928000. Its totient is φ = 7431782400.

The previous prime is 31577990387. The next prime is 31577990401. The reversal of 31577990400 is 409977513.

31577990400 is a `hidden beast` number, since 3 + 157 + 7 + 9 + 90 + 400 = 666.

It is a tau number, because it is divible by the number of its divisors (864).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31577990401) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 70329376 + ... + 70329824.

It is an arithmetic number, because the mean of its divisors is an integer number (150489500).

Almost surely, 2^31577990400 is an apocalyptic number.

31577990400 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31577990400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65011464000).

31577990400 is an abundant number, since it is smaller than the sum of its proper divisors (98444937600).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31577990400 is a wasteful number, since it uses less digits than its factorization.

31577990400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532 (or 507 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The spelling of 31577990400 in words is "thirty-one billion, five hundred seventy-seven million, nine hundred ninety thousand, four hundred".